The knee joint is recognized as one of the most complex joints in the human anatomy, playing a vital role in stability and mobility. Its anatomical configuration includes the femur, tibia, fibula and patella, which together contribute to static stability. In contrast, dynamic stability is facilitated by the surrounding musculature, tendons and ligaments, with particular emphasis on the anterior cruciate ligament (ACL) and posterior cruciate ligament (PCL). The importance of knee stability is emphasized during dynamic activities such as running and jumping, where the likelihood of injury, particularly to the ACL, is significantly increased. In cases of ACL injury, surgical reconstruction is often required to restore joint stability and functionality, especially in athletes. Postoperatively, kinesitherapy takes on a key role in the rehabilitation process, as it actively promotes the restoration of knee strength, stability and mobility through a regimen of targeted exercises. A physical therapy protocol typically includes progressive strength training, plyometrics, and agility exercises, all of which are critical to mitigating the risk of re-injury and facilitating safe reintegration into sports and daily activities.